Optical investigations of the indium selenide glasses

Binary alloys of InxSe100-x (with x = 7,12,17 and 22) were synthesized by mechanical alloying technique (MA). Then thin films of 200 nm in thickness were prepared by thermal evaporation technique under vacuum of 2 x 10(-5) Torr. X-ray diffraction patterns were investigated indicating that the films are amorphous in nature. Optical properties were investigated for the binary system by using spectrophotometer transmittance spectra in the wavelength (200-1100 nm). Optical constants. absorbance X(lambda) and complex dielectric constant have been determined using Swanepole method. Optical dispersion parameters E-o and E-d that were developed by Wemple-DiDmenico and the high frequency dielectric constant (epsilon(proportional to)) have been also, analyzed. The variations of the optical energy gap E-g for all the films composition were discussed. (C) 2003 Elsevier Ltd. All rights reserved.